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      Correlation between skinfold thickness and bioelectrical impedance analysis for the evaluation of body composition in patients on dialysis Translated title: Correlación entre la plicometría y el análisis de bioimpedancia eléctrica para la evaluación de la composición corporal en pacientes en diálisis

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          Abstract

          Abstract Introduction: Patients on dialysis have important changes in body composition. Objectives: To determine the correlation between skinfold thickness (SKF) and bioimpedance analysis (BIA) for estimating fat mass (FM) and lean body mass (LBM) in patients undergoing hemodialysis (HD) and peritoneal dialysis (PD). Methods: Cross-sectional study. We included 50 patients under dialysis treatment. To measure SKF, we used the Lange(r) skinfold caliper (Beta Technology, California, USA) and we carried out the impedance analysis with the Bodystat Quadscan 4000(r) (Quadscan, Isle of Man, UK). The measurements were performed post-hemodialysis. The PD patients were measured with and without peritoneal dialysate and body weight was corrected for peritoneal fluid. We determined the Pearson's correlation coefficient between SKF and BIA for estimating FM and LBM. We also evaluated the influence of age, sex, diuretic use, dialysis vintage, extracellular water (ECW), and intracellular water (ICW) through a multivariate regression analysis. Results: Of the 50-patient total, 29 were men (58%) and patient mean age was 46.3 ± 16.5 years. The correlation between SKF and BIA was r = 0.784 (p < 0.001) for FM and r = 0.925 (p < 0.001) for LBM. Age and sex influenced the variability of FM, whereas sex, age, and ECW influenced the variability of LBM, both evaluated through the SKF and BIA methods. Conclusion: SKF and BIA are useful methods in clinical practice. The strong and statistically significant correlations between the two methods show they are interchangeable. Age, sex, ECW, and ICW influence the variability of FM and LBM.

          Translated abstract

          Resumen Introducción: los pacientes en tratamiento con diálisis presentan cambios importantes en la composición corporal. Objetivos: determinar la correlación entre la plicometría y el análisis de bioimpedancia eléctrica (BIE) para la estimación de la masa grasa (MG) y la masa magra (MM) en pacientes sometidos a hemodiálisis (HD) y diálisis peritoneal (DP). Métodos: diseño transversal-analítico. Se incluyeron 50 pacientes en tratamiento con diálisis. Se utilizó el plicómetro Lange(r) (Beta Technology, California, USA) para la medición de pliegues cutáneos y la BIE fue realizada con el Bodystat Quadscan 4000(r) (Quadscan, Isle of Man, UK). Las mediciones fueron realizadas poshemodiálisis. Los pacientes en DP fueron medidos con y sin líquido peritoneal y el peso corporal fue corregido. Determinamos el coeficiente de correlación de Pearson entre la plicometría y la BIE en la estimación de la MG y la MM. Se evaluaron otras variables como edad, sexo, uso de diuréticos, tiempo en tratamiento de diálisis, agua extracelular (AEC) e intracelular (AIC) a través de un análisis de regresión multivariada. Resultados: veintinueve pacientes (58%) son del sexo masculino; la edad promedio de 46,3 ± 16,5 años. Se obtuvo una correlación significativa y positiva entre la plicometría y la BIE [r = 0,784 (p < 0,001) para MG y r = 0,925 (p < 0,001)] para MM. La edad y el sexo influyeron en la variabilidad de la MG, mientras que el sexo, la edad y el AEC influyeron en la variabilidad de la MM, evaluados con ambos métodos. Conclusiones: la plicometría y la BIE son métodos útiles en la práctica clínica. La correlación que se obtuvo entre los dos métodos muestra que son intercambiables. Por otro lado, variables como la edad, el sexo, el agua AEC y AIC se identificó que influyen en la variabilidad de la MG y MM.

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          Body composition estimates from NHANES III bioelectrical impedance data.

          Body composition estimates for the US population are important in order to analyze trends in obesity, sarcopenia and other weight-related health conditions. National body composition estimates have not previously been available. To use transformed bioelectrical impedance analysis (BIA) data in sex-specific, multicomponent model-derived prediction formulae, to estimate total body water (TBW), fat-free mass (FFM), total body fat (TBF), and percentage body fat (%BF) using a nationally representative sample of the US population. Anthropometric and BIA data were from the third National Health and Nutrition Examination Survey (NHANES III; 1988-1994). Sex-specific BIA prediction equations developed for this study were applied to the NHANES data, and mean values for TBW, FFM, TBF and %BF were estimated for selected age, sex and racial-ethnic groups. Among the non-Hispanic white, non-Hispanic black, and Mexican-American participants aged 12-80 y examined in NHANES III, 15 912 had data available for weight, stature and BIA resistance measures. Males had higher mean TBW and FFM than did females, regardless of age or racial-ethnic status. Mean TBW and FFM increased from the adolescent years to mid-adulthood and declined in older adult age groups. Females had higher mean TBF and %BF estimates than males at each age group. Mean TBF also increased with older age groups to approximately 60 y of age after which it decreased. These mean body composition estimates for TBW, FFM, TBF and %BF based upon NHANES III BIA data provide a descriptive reference for non-Hispanic whites, non-Hispanic blacks and Mexican Americans in the US population.
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            Assessment methods in human body composition.

            The present study reviews the most recently developed and commonly used methods for the determination of human body composition in vivo with relevance for nutritional assessment. Body composition measurement methods are continuously being perfected with the most commonly used methods being bioelectrical impedance analysis, dilution techniques, air displacement plethysmography, dual energy X-ray absorptiometry, and MRI or magnetic resonance spectroscopy. Recent developments include three-dimensional photonic scanning and quantitative magnetic resonance. Collectively, these techniques allow for the measurement of fat, fat-free mass, bone mineral content, total body water, extracellular water, total adipose tissue and its subdepots (visceral, subcutaneous, and intermuscular), skeletal muscle, select organs, and ectopic fat depots. There is an ongoing need to perfect methods that provide information beyond mass and structure (static measures) to kinetic measures that yield information on metabolic and biological functions. On the basis of the wide range of measurable properties, analytical methods and known body composition models, clinicians and scientists can quantify a number of body components and with longitudinal assessment, can track changes in health and disease with implications for understanding efficacy of nutritional and clinical interventions, diagnosis, prevention, and treatment in clinical settings. With the greater need to understand precursors of health risk beginning in childhood, a gap exists in appropriate in-vivo measurement methods beginning at birth.
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              Transcapillary exchange: role and importance of the interstitial fluid pressure and the extracellular matrix.

              This review will summarize current knowledge on the role of the extracellular matrix (ECM) in general and on the interstitial fluid pressure (P(if)) in particular with regard to their importance in transcapillary exchange. The fluid volume in the interstitial space is normally regulated within narrow limits by automatic re-adjustment of the interstitial hydrostatic and colloid osmotic pressures in response to perturbations in capillary filtration and by the lymphatics. Contrary to this commonly accepted view, P(if) can become an active force and create a fluid flux across the capillaries in several inflammatory reactions and trauma situations rather than limit the changes occurring. The molecular mechanisms involved in the lowering of P(if) include the release of cellular tension exerted on the collagen and microfibril networks in the connective tissue via the collagen-binding beta(1)-integrins, thereby allowing the glycosaminoglycan ground substance, which is normally underhydrated, to expand and take up fluid. Several growth factors and cytokines, including the platelet-derived growth factor BB, are able to reverse a lowering of P(if) and restore the normal compaction of the ECM. The magnitude of the lowering of P(if) varies with the inflammatory response. In several inflammatory reactions, a lowering of P(if) to -5 to -10 mmHg is seen, which will increase capillary filtration by 10-20 times since the normal capillary filtration pressure is usually 0.5-1 mmHg (skin and skeletal muscle). Unless this lowering of P(if) is taken into account, the enhanced solute flux resulting from an inflammatory response will be ascribed to an increased capillary permeability.
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                Author and article information

                Journal
                nh
                Nutrición Hospitalaria
                Nutr. Hosp.
                Grupo Arán (Madrid, Madrid, Spain )
                0212-1611
                1699-5198
                February 2018
                : 35
                : 1
                : 117-122
                Affiliations
                [1] orgnameUniversidad de Colima orgdiv1Medicine Faculty Mexico
                [2] orgnameHospital Regional Universitario orgdiv1Health Services of the State of Colima Mexico
                Article
                S0212-16112018000100117 S0212-1611(18)03500100117
                10.20960/nh.1284
                29565159
                82d55450-89b4-4498-853b-bf03e7524a38

                This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

                History
                : 15 May 2017
                : 29 May 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 38, Pages: 6
                Product

                SciELO Spain

                Categories
                Original Papers

                Bioelectrical impedance analysis,Dialysis,Lean body mass,Masa grasa,Masa magra,Fat mass,Pliegues cutaneous,Bioimpedancia eléctrica,Diálisis,Skinfold thickness

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